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Risk Management Activities - Maturity Analysis of Financial Liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Accounts payable and accrued liabilities | $ 599 | $ 413
Borrowings | 3,361 | 3,212
Exchangeable securities | 730 | 326
Dividends payable | 59 | $ 37
Liabilities | 6,051 |
Within one year |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Liabilities | 885 |
Lease commitments for short-term leases for which recognition exemption has been used | 13 |
2022 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Liabilities | 750 |
2023 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Liabilities | 331 |
2024 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Liabilities | 162 |
2025 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Liabilities | 901 |
More than five years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Liabilities | 3,022 |
Gross carrying amount |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 599 |
Borrowings | 3,264 |
Exchangeable securities | 750 |
Derivative financial assets | (12) |
Lease liabilities | 134 |
Interest expense on borrowings | 1,565 |
Dividends payable | 59 |
Gross carrying amount | 7% Unsecured Subordinated Debentures Due May 1, 2039 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Interest expense on borrowings | 210 |
Gross carrying amount | Commodity risk management |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | (542) |
Gross carrying amount | Within one year |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 599 |
Borrowings | 96 |
Exchangeable securities | 0 |
Derivative financial assets | (14) |
Lease liabilities | (5) |
Interest expense on borrowings | 161 |
Dividends payable | 59 |
Gross carrying amount | Within one year | 7% Unsecured Subordinated Debentures Due May 1, 2039 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Interest expense on borrowings | 53 |
Gross carrying amount | Within one year | Commodity risk management |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | (92) |
Gross carrying amount | 2022 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 0 |
Borrowings | 626 |
Exchangeable securities | 0 |
Derivative financial assets | 0 |
Lease liabilities | 6 |
Interest expense on borrowings | 153 |
Dividends payable | 0 |
Gross carrying amount | 2022 | 7% Unsecured Subordinated Debentures Due May 1, 2039 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Interest expense on borrowings | 52 |
Gross carrying amount | 2022 | Commodity risk management |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | (87) |
Gross carrying amount | 2023 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 0 |
Borrowings | 277 |
Exchangeable securities | 0 |
Derivative financial assets | (1) |
Lease liabilities | 5 |
Interest expense on borrowings | 126 |
Dividends payable | 0 |
Gross carrying amount | 2023 | 7% Unsecured Subordinated Debentures Due May 1, 2039 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Interest expense on borrowings | 53 |
Gross carrying amount | 2023 | Commodity risk management |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | (131) |
Gross carrying amount | 2024 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 0 |
Borrowings | 119 |
Exchangeable securities | 0 |
Derivative financial liabilities | (2) |
Lease liabilities | 5 |
Interest expense on borrowings | 119 |
Dividends payable | 0 |
Gross carrying amount | 2024 | 7% Unsecured Subordinated Debentures Due May 1, 2039 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Interest expense on borrowings | 52 |
Gross carrying amount | 2024 | Commodity risk management |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | (131) |
Gross carrying amount | 2025 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 0 |
Borrowings | 136 |
Exchangeable securities | 750 |
Derivative financial assets | 0 |
Lease liabilities | 5 |
Interest expense on borrowings | 113 |
Dividends payable | 0 |
Gross carrying amount | 2025 | 7% Unsecured Subordinated Debentures Due May 1, 2039 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Interest expense on borrowings | 0 |
Gross carrying amount | 2025 | Commodity risk management |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | (103) |
Gross carrying amount | More than five years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 0 |
Borrowings | 2,010 |
Exchangeable securities | 0 |
Derivative financial liabilities | (1) |
Lease liabilities | 118 |
Interest expense on borrowings | 893 |
Dividends payable | 0 |
Gross carrying amount | More than five years | 7% Unsecured Subordinated Debentures Due May 1, 2039 |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Interest expense on borrowings | 0 |
Gross carrying amount | More than five years | Commodity risk management |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial assets | $ (2) |

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